Shell very small, turbinate, perforated, rather thin. Sculpture consisting of radiate white membranaceous plaits, close together on the penultimate whorl, but gradually getting more distant on ap¬proaching the aperture, where there are about 9 plaits per millimetre. Between the plaits a good lens reveals close fine spiral striae, crossed by equally fine growth-lines. Colour rufous or pale horny. Epidermis thin, not shining, easily rubbed off. Spire conical, nearly as high as broad, a little higher than the aperture. Protoconch small, papillate, of 2 whorls, the first smooth, the second microscopically spirally striate. Whorls 5, rounded, the last rapidly increasing, rounded at the periphery; base convex. Suture deep. Aperture nearly circular, diagonal. Peristome simple, straight, slightly callous inside, the margins approximating and united by a thin parietal callus ; notch at the suture very slight. Columella arcuate, callous inside, not reflexed. Umbilicus pervious, very narrow, deep, partly hidden by the last whorl. Operculum horny, slightly concave, of few whorls onlv, nucleus central. Diameter: Maj., 2 mm. ; min., 1,75 mm. : height, 2,25 mm.
New Zealand: North Island only : Hunua Range, type (Major Broun) : Hillyer's Creek, near Auckland (C. Musson); Birkenhead (H. S.) ; Waitakerei Range (H. 8.) ; Mount Pirongia (A. T. Urquhart).